Unit One The City Mouse and the Country Mouse 1
Unit Two The Greatest Power 11
Unit Three Braille 22
Unit Four Plants 33
Unit Five The Animal Kingdom 43
Unit Six The Garden of Eden 55
Unit Seven Salt 66
Unit Eight Solar Energy 78
Unit Nine Tips on Small Talk 90
Unit Ten Etiquette in Foreign Countries 103
Unit Eleven Hobbies 115
Unit Twelve On the Study of Medicine 127
Unit Thirteen Why Do People Yawn? 140
Unit Fourteen The Best Age To Be 152
Unit Fifteen The Weather 164
Unit Sixteen Why Pollute Our Planet? 177
Append ix Glossary 190